Use the DUPLICATE_COL operation to duplicate a column of control points of a surface.
Click the icon and then click on any control point in one of the orthogonal projection views. A new column of control points will be inserted with coordinates coincident with control points of the column that the user clicked.
For Bezier surfaces, duplicate control points increase the weighting in that area of the surface, and the resulting interpolated surface follows the control points of the duplicated column more closely.
For Catmull-Rom surfaces, the resulting interpolated surface folds back and passes through the control points of the duplicated column a second time. This may result in the surface self-intersecting.
Switch between orthogonal projection views and continue duplicating columns.
Click the icon again to disable the DUPLICATE_COL mode.
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